Basic Electricity Primer: written by a top Navy ET by adrian angel

Author:adrian angel [angel, adrian]
Language: eng
Format: azw3, epub, pdf
Published: 2016-04-01T16:00:00+00:00

In Diagram A, you see three transistors. Each has its own crystal. And each has its own filter. The DC voltage powering each transistor is separate because they are isolated from each other by capacitors. But the capacitors will let AC signals cross them… so that the AC can get to each transistor and to go from the microphone on the far left to the antenna on the far right. Suppose a Beach Boy sings into the microphone on the left. His voice range and guitar would be from 60 Hertz to 22,000 Hertz. Then imagine that the crystal selected beneath transistor Number One vibrated at 100 Hertz. A signal as high as 22,100 Hertz would come out of the transistor. And imagine that the tuned filter was tuned for 22,100 Hertz. Then only the 22,100 Hertz signal would get by, cross over the capacitor to transistor Number Two. Imagine that the crystal under transistor Number Two vibrated at 200 Hertz. It would add to the 22,100 Hertz signal and come out of Transistor Number two at 22,300 Hertz. It would cross over if the filter was tuned for 22,300 Hertz. Then the signal crosses over the capacitor to enter transistor Number Three. Imagine that the crystal under this transistor vibrates at 500 Hertz. It adds to the incoming signal of 22,300 Hertz and a signal as high as 22,800 Hertz comes out. The tuned tank, if tuned to 22,800 Hertz would let this signal by to continue on to the antenna, eventually. On the way to the antenna the signal would enter Power transistors designed to boost the signal. These Power transistors are big metal cans and when I worked in a CB shop, the truckers wanted these for their CB radios. Thing is, they often would be so powerful that when the trucker keyed up his radio at the truck stop, it would blow out the nearby CB radios in the rigs parked next to his rig.

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